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Finding the Fourth Proportional to 317,835.61, 438,611.12 and 172,639.90

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Solution

The fourth proportional to 317,835.61, 438,611.12 and 172,639.90 is: 238,241.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,835.61 : 438,611.12 = 172,639.90 : x
  2. Step 2: Convert to fraction form
    317,835.61/438,611.12 = 172,639.90/x
  3. Step 3: Cross multiply
    317,835.61x = 438,611.12 × 172,639.90
  4. Step 4: Simplify right side
    317,835.61x = 75,721,779,895.69
  5. Step 5: Solve for x
    x = 75,721,779,895.69/317,835.61
  6. Step 6: Final answer
    x = 238,241.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.